docs: def appndc(item, cell):
      """
      Append an item to a character cell.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/appndc_c.html
  
      :param item: The item to append.
      :type item: str or list
      :param cell: The cell to append to.
      :type cell: spiceypy.utils.support_types.SpiceCell
      """
      assert isinstance(cell, stypes.SpiceCell)
      if isinstance(item, list):
          for c in item:
              libspice.appndc_c(stypes.stringToCharP(c), cell)
      else:
          item = stypes.stringToCharP(item)
          libspice.appndc_c(item, cell)